Malicious PDF — malware analysis report

Static analysis result for SHA-256 145372b7bff42923…

MALICIOUS

PDF

94.6 KB Created: 2021-09-01 06:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b02b6d64f9463af1c60efabfcd74724 SHA-1: d5f2336b8b22cd2108ecf20ac912bd484286a652 SHA-256: 145372b7bff42923513a41c313fa0021db8326983bdd1359c0829b67de400023
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The PDF structure itself is also noted as potentially compromised, with external URI and link farm heuristics firing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=diff+between+atomic+mass+and+mass+number PDF link annotation
    • https://leise.ru/admin/ckfinder/userfiles/files/9036793341.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612358c191a34---lofobubapuxofifopare.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/hcks3r0vf6sfbqt5du7rfscuk2/xawapikonipafezofokapefex.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/sojumidaritixa.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/33558492566.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/ratiriwixexiw.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/soxeturapemedazukaxonak.pdfIn PDF document text
    • http://cocoal.com/uploads/file/pawujarurexoderutim.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071275a0c97e---rugowojelobinaza.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210815015839.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc0716ac85---86584955634.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/54328695743.pdfIn PDF document text
    • http://uco-kampen.com/media/files/41115538814.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7368766e---xozekojaregopasuginevexa.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/kudavepali.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be46943fb2a---xopusugazaguve.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/352f6f2f2c95fe8796b74897ca4a3663/64254503646.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac454b1278c---xozawasefareman.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mq644k6dadul2q18nrga11mn83/sopuvewurebex.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/bamunumumisagunaxurexevep.pdfIn PDF document text
    • http://zatacorp.com/upload/files/zeravatebakomu.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/jinunusugurosefeda.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161010114e8309---35884699094.pdfIn PDF document text
    • http://darienhigh70.com/clients/878490/File/gubavenixeloburisikewe.pdfIn PDF document text
    • https://marigabung.com/contents//files/parimewojijarug.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/90305270779.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 19540 bytes
SHA-256: c74eaa34166a94c191e98cf8f42d88c7f2a0a0b56730ff8d082a33fdfe14eb63
font_02_sfnt_off000152c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C3 10920 bytes
SHA-256: 6265918158ebf48210a548ca493bf7b19dd4f215ef33d2d46c6e4fa7a652773b

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